Arnold, 48, is the Lebanon County district attorney and has held that post since 2006. Schroeder is a 61-year-old college history professor and community/environmental activist. The winning candidate will receive a $90,335-a-year post and be one of 50 members in the Pennsylvania Senate.

Part of York County: Conewago, East Manchester, Newberry and Springettsbury townships and Goldsboro, Lewisberry, Manchester, Mount Wolf, and York Haven.

Where can I vote?

In most cases, voters can go to their typical polling place. There are a couple of exceptions.

In York County, there are two changes in polling place locations. Voters who reside in East Manchester Township, who used to vote at Starview United Church of Christ, will need to go to the Northeastern York School District’s administration building at 41 Harding St., Manchester. Lewisberry Borough voters, who used to vote at the borough park building, should go to the Lewisberry Community Fire Co. at 105 W. Front St.

Dauphin County spokeswoman Amy Richards said there are no changes in polling place locations for this election, including the one at Fink Elementary School in the Middletown School District. School will be in session on Tuesday but security precautions will be in place.

In Lebanon County, elections director Michael Anderson said there are no changes in polling place locations and the same voting process used in November will be used for this special election.

Voters can also check whether they live in this district by entering their street address at www.vote411.org, a website run by the League of Women Voters that also provides a voters guide in this and all primary and general elections.

Do I have to show ID?

In Pennsylvania, the only voters who must show identification at the polls are first-time voters or people voting in a new location for the first time (example: if you’ve recently moved).

Qualifying photo IDs include: a Pennsylvania driver’s license, a state or federal government ID, a U.S. passport, and a student or employee ID.

Qualifying non-photo IDs include: a non-photo ID issued by the state or federal government, a current utility bill, a firearm permit, a current bank statement, a current paycheck or a current government check. The law requires that a non-photo ID must include your name and current address.

Two optical scanners will be available to scan ballots at each polling place in the four participating townships and some of the boroughs will have an extra one on hand in the event it is needed, said York County spokesman Mark Walters.

What if I’m challenged at the polls?

Your right to vote can be challenged by local election officials, poll watchers or another voter. But challenges are limited in scope.

Challenges can only be for an individual’s identity or place of residence; the challenger must have a good-faith basis to question identity or residency.

The judge of election will decide if the challenge is in good faith. If it is, and the judge is satisfied with your identity and residency, you must be allowed to vote.

If the judge cannot determine if the challenge is valid, you can have another voter from your same precinct vouch for you. After that, you must be allowed to vote.

If you cannot get someone to vouch for you, you must be allowed to vote using a provisional ballot. If it is later determined that you are eligible to vote, your ballot will be counted.

Who should I call if I have a voting problem?

Each Pennsylvania county has an elections office and can help if you’re having a problem. Here are the election offices in the special election:

Dauphin County: 717-780-6360

Lebanon County: 717- 228-4428

York County: 717-771-9604

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